Re: carb rust
Glyptol would be my choice.
Red, somewhat heavy coating impervious to oil, water, gasoline. Applied as a spray (thinner and more precise coating) or with a brush (heavier.)
You'll want to mask well those areas you don't want to gamble to "plug."
Used a lot on cast machine cases to prevent ingrained foundry sand from coming loose and getting into the moving parts.
A bit expensive. About $55 for either 12oz spray can or 32oz brush on.
Quality though...
Joe K
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Shudda kept the horse.
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